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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f1c00da36144908efe5acdfc90d16f685fb75fbbf05ab146410a79264eaead' 
  AND token = '1PDlsbcf8a4iFkzFF6C3LSN3YhD2YrHhPjXgvv4NLes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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