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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e84e81be7a46cde5b4251854700145d0582a5083903a99b099ad24565de6aee' 
  AND token = 'X0fP9Sgg9N7dNAiELQQlPXZ34IQErndNeuKIYDMCr50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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