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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ac1d8e625e67ee0f28f72ff8d311c065fb960bd008685359a86a05aba9d4c9' 
  AND token = '9l3D6ZFIS4eDe3plWcYUKjnbwpeNDliw+KhQ4rAGX7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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