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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e433601ccfc11853ae4ccc562c42101d0692b80174ba90c81af80309076dd7e4' 
  AND token = 'Qq1rR9faqA0r9eeXfgcj6MDlNeLVH5tDbb4Z0bO25y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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