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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36d17603dbdc2a18975519b67c788d46bf11327baee513ceddf066650fa2b21' 
  AND token = 'CCAZ58dPURd8sCGnFPHxGpSC2NWL0JvqZjsuPfmSPNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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