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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7164d1af8c92f11d18be27ceed732da2cdec2076b7c246cce4a8987021d1e621' 
  AND token = 'bpSc5a9QkQOJS1NeVkdUZJKlVOgBcyA79mvhrW/4ngI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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