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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca6ee1c60fb126d01705c03bd31dec1350cc1568bfcd1723f212f69d17fd423' 
  AND token = 'pvun2iNi1jMs6BcAy+EmmjdIlOZMhJtGEtAkOh1fanE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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