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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df3bd4416bdffda8aab790f1f3032b2fdb98791cb44888c69c7393006b537d15' 
  AND token = '7x6IWiDAScvQybIuZkRvgIV9c7WrbQtZc7X//CfZ340=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00147

JSON explain

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