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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc875f4fc8f0a662dd7672b50f9851dfc9632aa8d73f66f6ca9500dc4fb9f22' 
  AND token = 'dYvFS1zvXVxgUuekVE27kXltEFxAQ6olpc404cGZ1NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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