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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270baa9866348c9f2c5d92ba3a239e34842e08ff4733bc6ce3853b2152a46ccf' 
  AND token = 'bHI7D33+8dEo+iL8mfGO9kw9ae0FS3RhD52UH3IgHuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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