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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ad6eed6cb7680792f17a056b1d9b3fc243d90a2240a7f19d82393a7d0a4f59' 
  AND token = 'o9HI+hN+E7jcCprTZfjkUqKCRcrIjfW6+TCpi1kROW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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