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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e41be1fafab6145a27ac4b3b823ee6b3ad17d1260116ad0bc7100a01e0640b' 
  AND token = 'EaNHGFbWQzbXG6U5a7lvvRO6vaziISxnABc2URizArY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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