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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6bab6abdfd9e9f0c8ecaa630f681203f17c5db53ab152288e3850b059e6ed2' 
  AND token = 'srEcq9cUM4jwGNXaBZBkTXXDmLr79Z2J9dYRftwM1ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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