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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e703768e67d459b252e8a7fa648cf838e16affb6c3a1831b12c2fe1dce50d5cc' 
  AND token = '/351KWbbN2fiUkyU6rq8Vk/Hwhqu+5mWNcrhj4xi+CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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