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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba779d605ca55c84b8b5f6bdaa3f90e4b2c2d8fe99e91f989d8f635871ae323' 
  AND token = '8XXrnDZrTeO4w1ZoQWEMXAgO+yb4goQkK1c1FMwM19o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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