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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4bff8e8ece6fc8d63e5fa3a1beb6f67d4e5f574666a3f919bb28ee1b54e9e2' 
  AND token = '6TYyGGNSeVGARZsNvAWcpmnTLnnD6uq+A691iDt7a5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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