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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6b319a4e054b6fe0724fe0f392e69f7e06bcbc7c25443c5118126360a42bd4' 
  AND token = 'TdtarIVGoo6Fv5t+fX190NGL+OheG8ukXEC2ZZx/ack=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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