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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcb33c91424bbc8a8647a341863f44e41cec2e20c8055e61279b261f7902d69' 
  AND token = 'x6Cb/w8gfcvdOMDUp3LhluBSEp5Kwb7tAF9wUQSyVjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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