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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95033cd0e93023804c8d6d891e26bb772781088ddc4984013c9291d46dfd16a6' 
  AND token = 'IQVEivAV9n6oZ2HnXbxBkyXKPTb5P4Uckz72SWHXGSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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