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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fac0cd1a5e7084d0419c4115a7a57ecb92c91c968f679576e07f05cf18463f' 
  AND token = 'Bh99+eaf0oNDyABOtz39CRtDC8Dn+Wi84IhOfi1ASGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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