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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f5a4491c97583b83cdede9714b049b62ea1379613576965483e80ed923bcd7' 
  AND token = 'MNrCfE4jIpnren3lXqqW47RBy3Jal4GGEHDooKzlTHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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