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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d70be9a924b15f9dcd8f3b8579342e1f438fdfbb4aefa1c8528b0277497fbd' 
  AND token = 'H8kvV8N95GXDyc2HEOgYvJi7ahoxqCqLGOT+H5G1QQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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