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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bd9710c1f9132df4525fe11d37dc4055b55629ac68a36acf9ce3d2897edfd3' 
  AND token = 'ZFJU07Ora8/i9/Dyhmof4ZsvTW57n99DaFPPB4UFoPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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