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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60dd8810917065cfe52479b56de6b7698c34647b7f75659d04ab0e4f917556c3' 
  AND token = 'H7Bw9ds9n0GUgd8gX15G9sxz3flfSbgoBJHh9OzPfJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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