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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f6d31c84cb9d7ef535839803ab8697c9885c4832d3b500ef7865c072e26395' 
  AND token = 'B813f0v/tIP+5GK9/CS6/psJcuthpwe7PrYQrhm4dkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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