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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9a3028f06cfe831bcdd26ce16baaded4923c6f8490f91b6f32e87d5b2ca604' 
  AND token = 'V3MM/DQSF1rhx5boRJ2PBWkN5TE4PnIe9mv4rluSS94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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