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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8288a56e2632633213453d3ac12810ee69aabab48bb021956ade834d5d2719' 
  AND token = '0vbr4St20XQ4JA4Ii5SSuMZS/rZvyqmNCMCL6TsXle0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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