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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb51379eb11d9e4c0fe3ec012160319a8e9e4429c3b51824e5b702dbd68f4756' 
  AND token = 'YsdBohGCO2kt5BHiiyHILO9ncLtS8wV1NwZVex5RbJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00177

JSON explain

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