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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6acb0e75ec3d0b4d922759470085ff467d9e73a8e1d1ea35a7eb4a30704a94' 
  AND token = 'kQz9qFXgspQvHP4zbE0+eWaUq0j7lhnOl2iyzx5g96g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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