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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f664a13d2d761c573874f6ce1cec6c45772d2bc5177c3bd0e6b04ff51accd9cd' 
  AND token = 'rWQxcucNnJ5cmkSYE+OJZpsZHnR8phjAIKT4ea6m0iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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