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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ebb932a2f0b30dd53e14547ed1c4dbc7c8da6da4f30d8ea8ba472a1acc1196' 
  AND token = 'z6qaApfz0XIcOvaEz+ipoxOigAH1ft0d6OpwDs7Ddx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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