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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0bd672feabc128506fa10e87aafe9d756352a17596533c6d40e67ceb2da8f3' 
  AND token = 'X99hDJeiKk9d0yUtlzlpYORAaJLnVpHIr4nFNTuCRcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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