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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64e8e9508027b6d1bdad3558ad503812d6fda782cb4875b3cba457551648f8c' 
  AND token = 'DBPZPDnogNPrfk1D6h3FcD5ILRhlfLdtlHMzDcVvy9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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