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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5314ff3715f39187fae5ced84193b6a2ea9491ac74c2c80372d9d96921f49d39' 
  AND token = 'y+5ofiz0o0ziggnkHA28q3Go4UgKjHWNldgaQexfedw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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