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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cadb0a5458c9d9b3813edb21c4a9945febe2eb1c349cf90ec8d4ea5ad9d000a' 
  AND token = 'hv0EwUkfSrRMUh0g3GfwczAWsePAwPRwyR/1+5TtV84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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