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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd60d2b3937ac1c2783871e99c362824eb8572dcd8fd565224cfa5c81e6c0f7' 
  AND token = 'T3s54isEighXws89RVa38WJOtmzVKDTDNk4TvJVt+g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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