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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84bb5028eb73ea44d0662d9a7200e1feef40be7d47ca1122c63388921a71e48' 
  AND token = '12XX03GzN2SeKzMmr3vc/L6qY71YPQU5OE8cMgKKnhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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