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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b00d5871cc9a9ea2538a14e1301c30079e3ce701aa04e67ac731fac2b60cff' 
  AND token = 'di5HeSwKh3EZwN9BCeyhlwZcKlDNDYZFjJBiEbhgVVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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