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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6ff34ac233a0194e4b3a690f65a1e3c4512289446bb017e0f5b953b1fb2796' 
  AND token = 'gap4fCCJW46ZQfP0uGtdEUrhucZ6iYajsAX7KC+UbcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}