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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2789fd6065ff40fbb344da359d00df24593d7da882a8d703c3e0756806f539a' 
  AND token = 'CYwl4gVNnCc2nwpBfr/xvt0GVp6J/4sryinW8uM7WRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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