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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7aaf5de661df8f52a741be5ec80deb85cad1b7f3d65de2d0976438b6fc732b7' 
  AND token = 'FrdkcLNxeF7wtLJ5flQrYp8jlO3vkHmbQzmIoVBErv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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