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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9793d536ac714efb0a0268926a143cf1361c8d3d25523ef9f12c779434ee1ae0' 
  AND token = 'P8Vc9sdgRMa2RgRz9Hgoe9bg9HbA4hipjUU81rU4mMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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