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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a448038bb9e145a3a25f7b7566eadf11e08b54f44c2f0b7c4cd200876deafcc' 
  AND token = 'm/qVb6GIJaNMNjdQVWaInq1anX997NHJ7XIJHDI838U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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