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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa14da6c688d76f90b49ceb78a4fc72a2b6fe85c0600c79f3ee18e7c199dc1d3' 
  AND token = '6692hI6tNGx5TEAU+dhxfZxmZytuHTuQUroFlZGTgwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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