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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c4c6e91143e514562958fc7bce5cb4b3e895665a40c921097a975a698e1b1b' 
  AND token = 'qWJhsENstPjbLKDoJHrtLLMUhlBZwl2Ekq2FG/t23sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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