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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e4999878683ad245d6ab895743832956ed1c0624678583ff16a783c0a9b1a3' 
  AND token = 'hLc5JnI8wBZkxD2eMlSSZT9xmeu6R9YM44e/1K1PPuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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