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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a20dd3bf25d6c1cb98f53ecebc410e7340259cfeb27052fd958e0ed9e56c30b' 
  AND token = 'o0T5hL6niFPKlFBu88Bu/kxjyqoaPJGegN03MkNdhFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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