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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989114fe2f18c145480cc1c8a1c5f67193f425e4af8cb377dc142565d724f15d' 
  AND token = 'ZayINFWt6sZSVTeaXZi3lJzFG9vb0sITs6oIgJ0KU7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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