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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5f11e4d7f04594c2a83844568b5d8d7663c34e577d19c2df49c60f37ef58be' 
  AND token = '7aIYuttdd98X3qJwyQJHoYSnmmjZoKsCblyc2DrAGqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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