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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26802b36d6a3ac9e422c98b1ab514c7b5a48cd4fd1701d096362553c4783ad49' 
  AND token = 'Nok6bGO3Ka09L6NEN6nZ9LVl3w6F0+5C8taXpF7piLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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