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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fb9a1a3596d89fb2c1e6b7ba7e2ecb5f9766ab96beeefee5a7fe7d6023aef5' 
  AND token = 'AuaUaNB5A2mLnU/LnKgQfRgFrsfFSrJ3CEscAYKyyrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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