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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dee993e6da18e31dd853718cea90c753d644af1238772d3752a7e6dc6e1a77b' 
  AND token = 'GniqWQ1i3BNJ+AFgqJp12G34ATpO/MVbzXxqzkStw/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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