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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585feeed75bb271d3e1c768d03785bfd4171e2bf786e47f5fd6e035b88df1970' 
  AND token = '6KTnlXytfSLCm7Od18cVPaddyOUK0gvBd/RFqTX9Sfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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