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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f04d46e75582c62c5dc71e3286b222baa643a5617503e456ef9f30488ea30e' 
  AND token = 'Z0K7TkXGCnxqNiDCdn/k/0UmyVMCxgtgVn9t3CmRePU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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