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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd177b64f6feb63e77a587ce5086415855f00e37a0551adce79a6b93e148df43' 
  AND token = 'bWCv8DGTTfNPK1yvdbpuixTx56DyfSlUb8TQl5pCiuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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