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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a17cf4ee17d55cb6f7b25ce51b7a38b8d64ca5e1f8dc7e4a767d238de0a31da' 
  AND token = 'zY+4JoNSrKHrKegfN4MRdznkGuq1jW6Zll46eNy5US8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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