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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdefc4e948d5eae55834bfbd396db5dbdf2efc15b0bb1826904cba844d16557' 
  AND token = '092LLJKHyqr6e5fVT8cefBIEHoVhEgbH74nBIuwoT7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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