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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6692cd5e8436ab6c353448e8ce9bcf1b1185cb46eaa7b37fa4a8c25fba4424a9' 
  AND token = 'k+jVGr/myWDRnYSTavApulSQrRaHEQ7mWJm3X4713zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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