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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddadfb3108d9e18e773256ed5a820b5fd19c08b4409fae41bca7b5ba7783f520' 
  AND token = '3QgXFXWmcxVNPYg2/lfHslIG/8SrAZmUOoxeMRLN9hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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