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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367edce241bc807031274ba09c9f6de0bb6563e97b0c0dac998324ae5197e071' 
  AND token = 'OnhoFP/weq5Yre5TKyzF59oxqJm5x/sDOergk6hokMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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